Detroit Tru Trac and mpg

mp · **Posted:** Wed Jun 18, 2008 1:45 pm

Reading the thread started by Fulltimer got me thinking about the effect on my gas milage that installing a Detroit Tru trac would have. My libby is an '08 4x2 stock. I was wanting to give it what I could to drive up to at least a level three. If changing the gear ratios from stock to4.10 will hurt my gas milage on the interstate, what will changing the rear end do? Will milage be the same or better, or worse, when runningthe stock gears? Or should the gears be changed when the rear end is changed?

Thanks in advance,

michael

tjkj2002 · **Posted:** Wed Jun 18, 2008 2:29 pm

You will see zero mpg loss or gain from adding a TT in the rear diff.If you want to offroad just trade for a 4wd version,sorry but a 2wd just isn't good offroad.

mp · **Posted:** Wed Jun 18, 2008 2:36 pm

Then what would be the potential advantages to a TT on my 4x2? Will I have some increased handling in foul weather situations and winter conditions?

tjkj2002 · **Posted:** Wed Jun 18, 2008 2:50 pm

mp wrote:

Then what would be the potential advantages to a TT on my 4x2? Will I have some increased handling in foul weather situations and winter conditions?

Yes,but good tires is very helpful also.

sleeve84028 · **Posted:** Wed Jun 18, 2008 3:51 pm

Having both wheels receiving power should do wonders for any vehicle. I wish that the limited slip or something similar was standard on the KJ.

Fulltimer · **Posted:** Wed Jun 18, 2008 3:56 pm

The problem with 2wd is you have nothing up front to help you along. If you go over something high, and the front end drops down on the ground your stuck because your back tires are in the air. A 4X4 will pull itself off that thing with the front tires. Extra traction.

You would do better than the next guy on trail when he is stock but you will be severely limited in where you can go.

Terry

tjkj2002 · **Posted:** Wed Jun 18, 2008 3:59 pm

Fulltimer wrote:

The problem with 2wd is you have nothing up front to help you along. If you go over something high, and the front end drops down on the ground your stuck because your back tires are in the air. A 4X4 will pull itself off that thing with the front tires. Extra traction.

You would do better than the next guy on trail when he is stock but you will be severely limited in where you can go.

Terry

^^^^^^X2^^^^^^

I got a rather eye opening experiance on memorial day when my CV snapped and I was left in 2wd,even with my rear ARB locked my KJ only in 2wd was utterly useless offroad,the smallest obsticals where now impossible,you have no idea how much that front diff helping really does for offroading.

tommudd · **Posted:** Wed Jun 18, 2008 4:58 pm

tjkj2002 wrote:

Fulltimer wrote:

The problem with 2wd is you have nothing up front to help you along. If you go over something high, and the front end drops down on the ground your stuck because your back tires are in the air. A 4X4 will pull itself off that thing with the front tires. Extra traction.

You would do better than the next guy on trail when he is stock but you will be severely limited in where you can go.

Terry

^^^^^^X2^^^^^^

I got a rather eye opening experiance on memorial day when my CV snapped and I was left in 2wd,even with my rear ARB locked my KJ only in 2wd was utterly useless offroad,the smallest obsticals where now impossible,you have no idea how much that front diff helping really does for offroading.

Thats a fact ! I tore the front driveshaft out of my old 69 Bronco at one point, before I could go anywhere I pointed that thing, lockers front and rear, I thought no big deal, unbolted the rest of the front driveshaft and could not go a third of the places I had gone before, maybe out on the highway you would be OK but not back on any trails!

Tom

Pablo · **Joined:** Thu Feb 02, 2006 10:06 pm **Posts:** 1201

sleeve84028 wrote:

Having both wheels receiving power should do wonders for any vehicle. I wish that the limited slip or something similar was standard on the KJ.

I believe the 08 has traction control standard. It is lower maintenance and cheaper. Mine has worked well too.

I still may put a tru-trac in the front soon, however.

jason thompson · **Posted:** Wed Jun 18, 2008 10:12 pm

Like it was posted above 2wd is for the street
you have the traction control stuff so a TT will not be much help
You also stated you wanted to run level 3 trails I hope you are looking at trails on a 1-10 scale ,Jeep Jamboree
and not the standard 1-5 because a level 3 on a 1-5 will put a hurting on most stock wranglers and will destroy a 2wd KJ

I have a picture from a level 4 trail that shows rocks 1/2 the size of my TJ
it is about a 3+ going down and a 4+ going up in my book but rated other wise
it is doable on 33's and lockers when it is dry

here ya go level 3
the tree on my right ,passenger side, in this pic did the damage on my left ,driver side
imagine what it would have done to a 2wd KJ ,I am locked ,lifted and tucked with little concern about body damage

2006 KJ · **Posted:** Wed Jun 18, 2008 10:17 pm

one advantage of a limited slip or locker in the rear of a 2x4 is that you could do donuts like mad in the winter with posi!!! plus burnouts would look cooler and you'd have twice as much smoke.... :twisted:

bighause · **Posted:** Wed Jun 18, 2008 10:23 pm

Not to mention the fact that you don't have low range without 4wd either. Good luck negotiating any challenging trails in high range.

bearmedic · **Posted:** Tue Jun 24, 2008 9:23 am

i go mudding and running power lines trails all the time when im home in my 2wd kj granted i dont do the rocks or anything to that extent but if you wann get dirty in a mudd pit the locker will help having both wheels in back spinnin is better than havin most stock tj's or kjs' in 4wd and the lack of a low gear SUCKS "DONKEY BUTT" if your near florida the ocala jeep culub form what i understand is considerte to 2wd jeep as long as you still tread lightly and not play in the mud

aandlwoods · **Joined:** Mon Jun 09, 2008 4:53 pm **Posts:** 96

bearmedic wrote:

i go mudding and running power lines trails all the time when im home in my 2wd kj granted i dont do the rocks or anything to that extent but if you wann get dirty in a mudd pit the locker will help having both wheels in back spinnin is better than havin most stock tj's or kjs' in 4wd and the lack of a low gear SUCKS "DONKEY BUTT" if your near florida the ocala jeep culub form what i understand is considerte to 2wd jeep as long as you still tread lightly and not play in the mud

Sorry dude im raising the bs flag on that better than stock 4X4 comment. If you want to wheel then you need four wheel drive. You will not be happy until you get it. Before you waste a bunch of money on upgrades see what it costs to go ahead and trade up for the 4X4 when there are used ones available. Imagine how much it would suck to spend all this money and a stock4x4 kj or tj has to pull you out of that 2wd friendly mud pit....

hey medic, what part of Iraq? I was in Al Asad a few years back.

bearmedic · **Posted:** Tue Jun 24, 2008 12:00 pm

i was in arab jabour, well ill correct my self not better but equal to. oh and hey ill wheel my kj in mud next to your 4x4 any day of the week if i get stuck ill buy the drinks and your tank of gas you get stuck and i pull you you post pics of me pullin gyou out and laying off the 4x2 kj offroaders.

tjkj2002 · **Posted:** Tue Jun 24, 2008 12:33 pm

Quote:

well ill correct my self not better but equal to.

Sorry another BS flag on that one.When I broke my CV joint I was left only being able to use 2hi,even with my rear ARB locked my KJ was utterly useless without that front diff pulling while the rear diff was pushing.

The only way a 2wd is close to a 4wd is if the 2wd has 38"+ tires and the 4wd is still on 30" tires,then they may be close to equal.

bearmedic · **Posted:** Tue Jun 24, 2008 12:54 pm

mind you i dont do the whol rock deal o mountainous trails, i stick to sand trails and mud bogg trails and mud runs if youve not been to one go to it, im not saying a 2wd kj needs to be on moab or rubicon or anythign like that im saying he can still get down and dirty and be safe with it and be confident in his vehicle (other wise i wouldnt own a tj too)

aandlwoods · **Joined:** Mon Jun 09, 2008 4:53 pm **Posts:** 96

Medic, its a deal... but what if neither of us get stuck....
I havent updated my signature yet to show the AL's 6 inch lift, dual arb air lockers and 33 in MTR's...

because thats all still a dream...

bearmedic · **Posted:** Wed Jun 25, 2008 1:31 am

so hwere are you aand? ive got a few days before i leave kuwait.........darn re intergration and port detail? you any where near ga or what ? well if neither get stuck then we are out there having a good time and hell ill still buy some drinks for the hell of it. i wanna find some one to run beasley knob with me after i get my rear end locked to see how well it may do on rocks

drew

Detroit Tru Trac and mpg

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